### Chapter #8 :Waves and Sound : Short Q/A / C.R.Q's

**Q. If a pendulum is vibrated at a deep well .What will be the effect on the Time Period?**

Ans. As we know that g decreases with the depth.

g’=g
(1-d/ R

_{e}^{ 2})
and the
time period of the pendulum is

T=2π√
l/g

So
according to the formula if the value of the g decreases the time period will
increase

Then if a pendulum is vibrated at a deep well its time
period will be grater than on earth.

**Q. A wire hangs from a dark high tower so that the upper end is not visible. How can we determine the length of the wire?**

Ans. First we tied a point mass with this string and then
make it vibrate. The time period of this pendulum can be noticed. Now a/c to
formula

L=gT/4
π

^{2 }
By knowing
the value of g, the time period of vibration the length of wire can be
calculated.

**Q. Is it possible for two identical waves traveling in the same direction along a string to give rise to a stationary wave?**

Ans. No . A standing wave, also known as a stationary wave, is a wave that
remains in a constant position. This phenomenon can occur because the medium is
moving in the opposite direction to the wave, or it can arise in a stationary
medium as a result of interference between two waves traveling in opposite
directions.

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